N80油管钢在模拟油田CO2环境中的腐蚀行为

为了研究模拟CO2环境中温度和CO2分压对N80钢腐蚀行为的影响，采用失重法和扫描电子显微镜分析了试样的腐蚀速率、腐蚀形态和腐蚀产物膜形貌。结果表明，随着温度的升高，N80钢的腐蚀速率呈先增大后减小的趋势，90 ℃时达到最大值；温度较低时，试样表面附着的腐蚀产物较少，以均匀腐蚀为主；温度升高，腐蚀产物膜增厚，疏松、不均匀，发生明显的局部腐蚀；温度较高时，腐蚀产物膜致密、稳定，又转变为均匀腐蚀。随着CO2分压的升高，N80钢的腐蚀速率逐渐增大，腐蚀产物膜较厚且不完整，局部腐蚀严重。

Corrosion Behavior of N80 Tubular Steel in Simulated Oilfield CO2 Environment

In order to study the effects of temperature and CO2 partial pressure on the corrosion of N80 steel in simulated CO2 environment, the corrosion rate, corrosion appearance and morphology of corrosion product film of the samples were analyzed by weight loss method and scanning electron microscope. The results showed that the corrosion rate of N80 steel increased firstly and then decreased as temperature increased, and the peak value of the corrosion rate occurred at 90 ℃. When the temperature was lower, the surface of sample was covered with a slight amount of corrosion products, and the corrosion type was mainly uniform corrosion. With the increase of temperature, the corrosion product film became thicker, loose and uneven, and obvious localized corrosion occurred. When the temperature was higher, the corrosion product film were compact and stable, and the corrosion type was transformed into uniform corrosion. With the increase of CO2 partial pressure, the corrosion rate of N80 steel increased gradually, and the corrosion product film was thicker and incomplet with severe localized corrosion.